Folding box



sept. 17, 1935. F, J, PETERSON 2,014,695

. INVENTOR ederz'c/f JPee/salz l ATToRNEYs FOLDING BOX 2 Sheets-Sheet 2Filed Fieb. 5, 1935 NVENTOR AT1-ORN EYs Patented Sept. 17, 1935 nl'rsoTES niet

Nr crie FOLDING- BOX Application February 5, 1935, Serial No. 5,019

2 Claims.

This invention relates to folding paper boxes and resides mainly in animproved locking means whereby the respective box sections, when foldedinto operative form, are each so effectively inter locked that theycannot be accidentally opened up or unfolded when being handled, as, forexample, in the case of a shoe box when being pulled from a shelf. Insuch a case the tug on the end of the box frequently applies such aheavy strain thereto that unless the end folds are securely locked theend of the box is liable to open up. The construction is also such that,in the preferred form, the box assembly as an entirety is greatlystrengthened against collapse` In the drawings- Fig. l is a perspectiveView of the entire boX assembly;

Fig. 2 is an enlarged perspective View of the inside of the box bodysection;

30 Fig. 3 is a similar view of the boX cover section;

Fig. 4 is an enlarged sectional view on line 4 4 of Fig. 1;

Fig. 5 is a sectional View taken on line 5 5 of Fig. l;

Fig. 6 is a plan view of the blank for the cover section;

Fig. '7 illustrates a fragmentary perspective view of a modification.

Inasmuch as the interlocking means shown in.

the drawings is the same for both the cover section and the body sectionof the box, a detailed description of said means as applied to the coversection will suiiice. As indicated in Fig. 6, it will be seen that theblank may be scored in any well known manner on all lines where bends orfolds are to occur to facilitate bending or buckling the same, asrequired. l represents that portion of the blank that is to constitutethe bottom of the cover section. 2 2 are opposed portions of the blankthat are to be bent up to form the sides of the cover section. 3 3 areopposed portions of said blank that are to be bent up to form the outerend walls of the cover section. 4 4 represent intervening cornerportions designed to be 4.5 buckled inwardly. 5 5 are flaps on theopposed portions 3 3 that are bent inwardly to form the inner end wallsof said cover section. 5 6 are score lines that may be provided betweenthe end portions 3 3 and the flaps 5 5 to facilitate bending the flapsinwardly. 1 1 are score lines which run parallel to and near the endedges of the flaps 5 5, the portions of said flaps outside of said linesforming terminal locking lips 5*-5. 8 8 represent locking meanspreferably in the form of strips glued or otherwise fastened to theinside of the bottom portion I near to but spaced from the end portions3 3. The edges 8' of these strips that face the adjacent end portionsare raised or bent up rela-tively to the bottom l to form pockets orrecesses thereunder, to 5 receive therein the edges of the locking lips5 5', when the blank is folded to form the cover section. The edge 8 ofeach strip 8 is spaced away from the base of the adjacent wall 3sufficiently to permit the locking lip 5 to clear said edge il' 10 whenthe flap 5 is pressed back against said wall 3. When the side and endportions of the blank are bent up, the buckled in corner portions arefolded back against the inside of the opposed end walls 3 3. The aps 5 5are then folded inwardly 15 to overstand said folded in corner portions.As these flaps 5 5 are folded inwardly and down.- wardly, the lockinglips 5 5 will encounter the bottom portion I, bend inwardly, and slideover the locking strips 3 8. Upon merely releasing 2o the foldingpressure on the naps 5 5, the natural spring of the same will cause theedges of the locking lips 5' 5 to be automatically projected into thepockets underneath the edges 8 S from which they cannot be accidentally25 dislodged by any amount of severe handling in the intended use of thebox.

In the body section of the box, the flaps are on the sides thereofinstead of on the ends. It is unnecessary to describe in detail theconstruction 30 of the means for locking these side flaps of the bodysection since such. means shown corresponds to the means alreadydescribed. It is important that whereas the locking strips 8 3 for thecover section run transversely of the box, the locking 35 strips for thebody section run longitudinally thereof. These strips for the bodysection are indicated at 9 9. The cover section is of coursesufliciently larger than the body section so that it may be telescopedtherewith in the usual man- 40 ner. By this arrangement the entire boxassembly, as shown in Fig. 1, is powerfully reinforced at both ends andsides by three thicknesses of stock, plus the stiifening effect of thestrips 8 8 and 9 9, and will therefore withstand very rough 45 usagewithout danger of collapse.

In Fig. 7, I have shown a modification in which i!) represents the bodyof a metallic clip having a raised lip I0 to form a recess or pocketunder the same. IEW-IB are spurs on the body of the 50 clip which may bepunched through the cardboard and clinched on the underside to hold theclips in place. Such clips may be substituted instead of the strips 8 8or 9 9 to provide the undercut locking pockets for the edges 55 of thelocking lips. Here again it is essential that the raised edge of the lipl shall be spaced away from the wall 3 sufficiently to permit thelocking lip 5 to be automatically engaged under the lip IU by the mereact of folding in the flap 5 and then releasing the folding pressure.

I am well aware thatl some changes and modifications may be made in theconstructions described without avoiding the invention or the scope ofthefollowing claims.

I claim:

1. A folding box section comprising a bottom portion, opposed sideportions, opposed end portions, intervening corner portions folded backagainst the inner walls of two of said opposed portions, flaps on thelatter portions folded inwardly to overstand said folded-back cornerportions, locking lips at the ends of said iiaps, and means secured tothe bottom portion and providing undercut pockets to receive the edgesof said locking lips, said means being spaced sufficiently from theadjacent outer wall to allow the locking lips to clear the same andautomatically project into said pockets as pressure on the flapscarrying said locking lips is released. 2. A folding box sectioncomprising a bottom portion, opposed side portions, opposed endportions, intervening corner portions folded back against the innerwalls of two of said opposed portions, vflaps on the latter portionsfolded inwardly to overstand said folded-back corner p0rtions, lockinglips at the ends of said flaps, and strips secured to the inside of thebottom portion substantially parallel to said flaps and shaped to formundercut pockets spaced away from the adjacent walls of said box sectionsufficiently to permit the edges of said locking lips to pass over andclear the edges of said strips as the flaps are pressed back toward theadjacent outer walls and to automatically project into said pockets whenpressure en said flaps is released.

FREDERICK J. PETERSON.

